Energy: Potential Energy is the energy of position and potential energy vaires with the amount of Kinetic Energy.
Potential Energy is expressed as Mass x Gravity x height (MGH)
Gravitational Potential Energy:
Gravitational Potential Energy = weight x height Kinetic Energy is the energy of motion and is inversly proportional to Potential Energy.
Kinetic Energy is expressed as (1/2) mass x velocity squared ((1/2)mv^2)
If the speed of an object is doubled, the kinetic energy of the object is quadrupled.
it takes 4x as much work to double the kinetic energy.
Both Kinetic and Potential Energy are measured in Joules (J)
Mechanical Energy: is using both potential energy and kinetic energy and decides the true energy that an object exerts. Work: When work is described as "How long?" meaning a variation of time the equation reads as Force x Time (W=FT) This is called Impulse
When work is described a as being "How long?" in a variation of distance the equation reads as Force x Distence (W=Fd)
Basically work is the movement of something over time and distance.
2000N of force going a distance of 4 meters the equation is 2000(4)= 8000J Power: Doing work does not describe a human because if a human is running he gets tired and therefore is not running at a constant pace, so we use Power to determine work and distance. Power is described as Force x distance/ Time Interval (Fd/T) or more simply Work done / Time Interval (W/T).
Power is measured in Watts (W).
So if there is 500J of work done over a 5 second time there is 100W of Power.
Law of Conservation of Energy:
Energy cannot be created or destroyed. It can be transformed from one form to another, but the total amount of energy never changes.
Machine: a device used to multiply forces or simply to change the direction of forces.
Lever - the work done at one end is equal to the work done on the load at the other end.
Fulcrum - pivot point of the lever
Pulley - a type of lever that can be used to change the direction of a force
Mechanical Advantage: The ratio of output force to input force for a machine Efficiency = Useful work output or actual mechanical advantage
Total work input theoretical mechanical advantage
efficiency will always be a fraction less than 1
example .45 x 100% or 45% efficiency
a 4 engine airplane gives out .25 efficiency so total it gives out 100% efficiency (25% per engine)
Energy for Life: all life needs some sort or energy whether it be a human needing food and carbs for energy or plants needing sunlight (photosynthesis) so they can survive.
Potential Energy is the energy of position and potential energy vaires with the amount of Kinetic Energy.
Gravitational Potential Energy:
Gravitational Potential Energy = weight x height
Kinetic Energy is the energy of motion and is inversly proportional to Potential Energy.
- Kinetic Energy is expressed as (1/2) mass x velocity squared ((1/2)mv^2)
- If the speed of an object is doubled, the kinetic energy of the object is quadrupled.
- it takes 4x as much work to double the kinetic energy.
Both Kinetic and Potential Energy are measured in Joules (J)Mechanical Energy: is using both potential energy and kinetic energy and decides the true energy that an object exerts.
Work: When work is described as "How long?" meaning a variation of time the equation reads as Force x Time (W=FT) This is called Impulse
When work is described a as being "How long?" in a variation of distance the equation reads as Force x Distence (W=Fd)
Basically work is the movement of something over time and distance.
2000N of force going a distance of 4 meters the equation is 2000(4)= 8000J
Power: Doing work does not describe a human because if a human is running he gets tired and therefore is not running at a constant pace, so we use Power to determine work and distance. Power is described as Force x distance/ Time Interval (Fd/T) or more simply Work done / Time Interval (W/T).
Power is measured in Watts (W).
So if there is 500J of work done over a 5 second time there is 100W of Power.
Law of Conservation of Energy:
Energy cannot be created or destroyed. It can be transformed from one form to another, but the total amount of energy never changes.
Machine: a device used to multiply forces or simply to change the direction of forces.
- Lever - the work done at one end is equal to the work done on the load at the other end.
- Fulcrum - pivot point of the lever
- Pulley - a type of lever that can be used to change the direction of a force
Mechanical Advantage: The ratio of output force to input force for a machineEfficiency = Useful work output or actual mechanical advantage
Total work input theoretical mechanical advantage
- efficiency will always be a fraction less than 1
- example .45 x 100% or 45% efficiency
- a 4 engine airplane gives out .25 efficiency so total it gives out 100% efficiency (25% per engine)
Energy for Life: all life needs some sort or energy whether it be a human needing food and carbs for energy or plants needing sunlight (photosynthesis) so they can survive.